You can do a lot of testing, and photograph charts and such, but until you get out there and actually expose some film, using the pinhole as intended, you will never know whether you'll be satisfied or not.
I have seen pinhole photographs that I could have sworn were photographed with a lens; that's how sharp they were. But then again, what's the point of using a slow and impractical pinhole?
My own experience with pinhole is with a simple Zero Image 2000 medium format pinhole camera. It doesn't have the absolutely best pinhole in the world, but it's good enough to make 14" square prints from 6x6 negatives, where if enough attention is paid to the printing values, contrast, toning, etc, sharpness isn't really an impediment.